340
FNCA52 TJSJ 200830
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
430 AM AST TUE JAN 20 2026
DISCUSSION
A MORE VARIABLE WEATHER PATTERN WILL PERSIST ACROSS THE AREA,
WITH FLUCTUATIONS IN MOISTURE. HOWEVER, SOME BRIEF PERIODS OF
LOWER RELATIVE HUMIDITY ARE EXPECTED, WITH VALUES DROPPING INTO
THE MID-40S TO LOWER 50S. SURFACE WINDS WILL REMAIN ELEVATED, WITH
SUSTAINED WINDS UP TO 15 KNOTS AND OCCASIONAL GUSTS, PARTICULARLY
ACROSS THE SOUTHERN COASTAL PLAINS. DESPITE PERIODIC INCREASES IN
MOISTURE, FUELS REMAIN ON THE DRIER SIDE, SUPPORTING FAVORABLE
FIRE-WEATHER DISPERSION. AS A RESULT, FIRE-WEATHER CONDITIONS WILL
REMAIN MODERATE TODAY.
PRZ014-210830-
SOUTHEAST COASTAL PLAINS-
430 AM AST TUE JAN 20 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 40
TEMP (24H TREND) 88 (+2) 71 (-1) 87
RH % (24H TREND) 48 (-4) 86 (-2) 46
WIND 20FT/EARLY(MPH) E 19 G25 NE 14 G18 E 20 G26
WIND 20FT/LATE(MPH) E 19 G25 NE 14 G18 E 20 G26
MIXING HGT(FT-AGL/MSL)5510 6050
TRANSPORT WND (MPH) E 22 E 23
VENT RATE (KT-FT) 104690 121000
DISPERSION 5 5
DSI 5 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-210830-
SOUTHERN HILLS-
430 AM AST TUE JAN 20 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 20 30
TEMP (24H TREND) 84 (+3) 68 (-2) 83
RH % (24H TREND) 61 (-2) 91 (+2) 59
WIND 20FT/EARLY(MPH) E 17 NE 14 E 17
WIND 20FT/LATE(MPH) E 17 NE 14 E 17
MIXING HGT(FT-AGL/MSL)6150 6830
TRANSPORT WND (MPH) E 20 E 23
VENT RATE (KT-FT) 104550 136600
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-210830-
NORTH COASTAL PLAINS-
430 AM AST TUE JAN 20 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 50 40
TEMP (24H TREND) 86 (0) 70 (-1) 86
RH % (24H TREND) 63 (0) 97 (+2) 62
WIND 20FT/EARLY(MPH) E 23 G25 E 21 G23 E 21 G24
WIND 20FT/LATE(MPH) E 23 G25 E 21 G23 E 21 G24
MIXING HGT(FT-AGL/MSL)5170 5250
TRANSPORT WND (MPH) E 22 E 25
VENT RATE (KT-FT) 98230 115500
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-210830-
NORTHERN HILLS-
430 AM AST TUE JAN 20 2026
TODAY TONIGHT WED
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 30
TEMP (24H TREND) 85 (+1) 68 (-1) 84
RH % (24H TREND) 62 (+3) 96 (0) 61
WIND 20FT/EARLY(MPH) E 20 E 19 E 19 G22
WIND 20FT/LATE(MPH) E 20 E 19 E 19 G22
MIXING HGT(FT-AGL/MSL)6070 6140
TRANSPORT WND (MPH) E 18 E 24
VENT RATE (KT-FT) 97120 128940
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-210830-
WEST COAST-
430 AM AST TUE JAN 20 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 20 60
TEMP (24H TREND) 87 (+1) 69 (-1) 87
RH % (24H TREND) 61 (0) 92 (+3) 58
WIND 20FT/EARLY(MPH) E 18 E 19 E 20
WIND 20FT/LATE(MPH) E 18 E 19 E 20
MIXING HGT(FT-AGL/MSL)5130 5790
TRANSPORT WND (MPH) E 13 E 20
VENT RATE (KT-FT) 56430 98430
DISPERSION 5 5
DSI 5 5 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-210830-
EASTERN INTERIOR-
430 AM AST TUE JAN 20 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 40 50
TEMP (24H TREND) 85 (+2) 69 (-2) 84
RH % (24H TREND) 65 (0) 93 (-1) 63
WIND 20FT/EARLY(MPH) E 17 E 16 E 17
WIND 20FT/LATE(MPH) E 17 E 16 E 17
MIXING HGT(FT-AGL/MSL)5630 5800
TRANSPORT WND (MPH) E 21 E 23
VENT RATE (KT-FT) 101340 116000
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-210830-
LUQUILLO MOUNTAIN RANGE-
430 AM AST TUE JAN 20 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 50 60
TEMP (24H TREND) 81 (+4) 68 (-2) 80
RH % (24H TREND) 70 (-1) 96 (+1) 68
WIND 20FT/EARLY(MPH) E 14 G17 E 12 E 14 G17
WIND 20FT/LATE(MPH) E 14 G17 E 12 E 14 G17
MIXING HGT(FT-AGL/MSL)3870 4190
TRANSPORT WND (MPH) E 23 E 24
VENT RATE (KT-FT) 77400 87990
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-210830-
CENTRAL MOUNTAIN RANGE-
430 AM AST TUE JAN 20 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 20 30
TEMP (24H TREND) 82 (+2) 65 (-2) 82
RH % (24H TREND) 62 (0) 95 (0) 61
WIND 20FT/EARLY(MPH) E 16 E 16 E 17
WIND 20FT/LATE(MPH) E 16 E 16 E 17
MIXING HGT(FT-AGL/MSL)7110 7240
TRANSPORT WND (MPH) E 15 E 21
VENT RATE (KT-FT) 92430 130320
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-210830-
CAYEY MOUNTAIN RANGE-
430 AM AST TUE JAN 20 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 50
TEMP (24H TREND) 80 (+2) 67 (-3) 80
RH % (24H TREND) 71 (0) 93 (-1) 69
WIND 20FT/EARLY(MPH) E 14 NE 11 E 14
WIND 20FT/LATE(MPH) E 14 NE 11 E 14
MIXING HGT(FT-AGL/MSL)4500 4990
TRANSPORT WND (MPH) E 23 E 24
VENT RATE (KT-FT) 90000 104790
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-210830-
VIEQUES-
430 AM AST TUE JAN 20 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 50 50
TEMP (24H TREND) 86 (+1) 73 (-2) 86
RH % (24H TREND) 59 (-2) 90 (+2) 58
WIND 20FT/EARLY(MPH) E 19 G24 E 19 G24 E 20 G24
WIND 20FT/LATE(MPH) E 19 G24 E 19 G24 E 20 G24
MIXING HGT(FT-AGL/MSL)3500 3850
TRANSPORT WND (MPH) E 26 E 26
VENT RATE (KT-FT) 80500 88550
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-210830-
CULEBRA-
430 AM AST TUE JAN 20 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 40
TEMP (24H TREND) 87 (+1) 74 (-3) 87
RH % (24H TREND) 62 (-1) 90 (+3) 59
WIND 20FT/EARLY(MPH) E 19 G24 E 19 G24 E 19 G24
WIND 20FT/LATE(MPH) E 19 G24 E 19 G24 E 19 G24
MIXING HGT(FT-AGL/MSL)3510 3860
TRANSPORT WND (MPH) E 25 E 26
VENT RATE (KT-FT) 77220 88780
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-210830-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
430 AM AST TUE JAN 20 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 20 30
TEMP (24H TREND) 88 (+1) 70 (-2) 88
RH % (24H TREND) 50 (-2) 85 (+1) 47
WIND 20FT/EARLY(MPH) E 23 G29 E 19 G24 E 23 G30
WIND 20FT/LATE(MPH) E 23 G29 E 19 G24 E 23 G30
MIXING HGT(FT-AGL/MSL)5790 6180
TRANSPORT WND (MPH) E 18 E 21
VENT RATE (KT-FT) 92640 111240
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-210830-
SAINT THOMAS AND SAINT JOHN-
430 AM AST TUE JAN 20 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 30 30
TEMP (24H TREND) 85 (0) 70 (-6) 86
RH % (24H TREND) 63 (0) 100 (+10) 59
WIND 20FT/EARLY(MPH) E 20 G25 E 19 G24 E 20 G25
WIND 20FT/LATE(MPH) E 20 G25 E 19 G24 E 20 G25
MIXING HGT(FT-AGL/MSL)3630 3850
TRANSPORT WND (MPH) E 25 E 28
VENT RATE (KT-FT) 79860 92400
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-210830-
ST CROIX-
430 AM AST TUE JAN 20 2026
TODAY TONIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 40
TEMP (24H TREND) 86 (0) 75 (0) 87
RH % (24H TREND) 63 (0) 87 (-2) 59
WIND 20FT/EARLY(MPH) E 20 G24 E 19 G23 E 19 G23
WIND 20FT/LATE(MPH) E 20 G24 E 19 G23 E 19 G23
MIXING HGT(FT-AGL/MSL)4170 4480
TRANSPORT WND (MPH) E 29 E 28
VENT RATE (KT-FT) 104250 107520
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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